1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
if not modules then modules = { } end modules ['grph-mem'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- very experimental and likely to change
--
-- \startluacode
-- figures.setmemstream("whatever",io.loaddata("t:/sources/cow.pdf"))
-- \stopluacode
--
-- \externalfigure[memstream:///t:/sources/cow.pdf]
-- \externalfigure[memstream:///whatever]
local gsub = string.gsub
local report = logs.reporter("memstream")
local trace = false trackers.register ("graphics.memstreams", function(v) trace = v end)
local data = { }
local opened = { }
local function setmemstream(name,stream,once)
if once and data[name] then
if trace then
report("not overloading %a",name) --
end
return data[name]
end
local memstream, identifier = epdf.openMemStream(stream,#stream,name)
if not identifier then
report("no valid stream %a",name)
identifier = "invalid-memstream"
elseif trace then
report("setting %a with identifier %a",name,identifier)
end
data [name] = identifier
opened[name] = memstream
return identifier
end
resolvers.setmemstream = setmemstream
function resolvers.finders.memstream(specification)
local name = specification.path
local identifier = data[name]
if identifier then
if trace then
report("reusing %a with identifier %a",name,identifier)
end
return identifier
end
local stream = io.loaddata(name)
if not stream or stream == "" then
if trace then
report("no valid file %a",name)
end
return resolvers.finders.notfound()
else
return setmemstream(name,stream)
end
end
local flush = { }
function resolvers.resetmemstream(name,afterpage)
if afterpage then
flush[#flush+1] = name
else
opened[name] = nil
end
end
luatex.registerpageactions(function()
if #flush > 0 then
for i=1,#flush do
opened[flush[i]] = nil -- we keep of course data[name] because of reuse
end
flush = { }
end
end)
figures.identifiers.list[#figures.identifiers.list+1] = function(specification)
local name = specification.request.name
if name then
local base = gsub(name,"^memstream:///","")
if base ~= name then
local identifier = data[base]
if identifier then
if trace then
report("requested %a has identifier %s",name,identifier)
end
specification.status.status = 1
specification.used.fullname = name
else
if trace then
report("requested %a is not found",name)
end
end
end
end
end
figures.setmemstream = resolvers.setmemstream
|
